Only two options, doesn't ask rocket science to verify...
That's correct.
Data Sheets
I guess they would have drawn them with unequal lengths.
I think the simplest explanation is that OP's part is not from that manufacturer. Perhaps they got it from a third party that cut one lead.Seemingly endless possibilities. 
I disagree. The simplest explanation is that the OP has supplied the correct datasheet for the part, the photo in post #11 matches the part and the unequal leg lengths in the photo match the tolerances in the datasheet. The "step drawing" is an oversimplification and otherwise irrelevant.
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Okie dokie, then!
You obviously have no experience in reading dimensioned mechanical drawings.
If the leads were of unequal length then they would be shown as unequal length with two different dimensions.
As shown in the drawing the dimension K applies to both leads not just one or the other.
The minimum applies to both leads not one or the other.
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Try using your multimeter -- diode check:
probes on each lead and
shine (direct) your smartphone's white LED (flash) into the aperture.
If the resistance / reading doesn't change then swap the leads and try again.
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the other option that the transistor is not new and lost a part of its leg in your previous life...
Yes I think I covered that option here
I don't have a dog in this hunt, so whatever the reason is fine with me.
That has been previously mentioned.
I have purchased this kit and it doesn't seems like This is the case , and details i have provided is as that mentioned by manufacturer , probably there is some technical inconsistency
@probability_density
Does not matter which is longer or shorter.
As I explained back in post #4 the one on the left is the emitter
How do you begin to explain that you have implied on four occasions that the OP has misled us by providing a data sheet which was not relevant to the part.
See posts #9, #15, #20, and #32 [actually post @21 also]
This assertion now appears to be incorrect.
This is the Digikey kit the OP has purchased (post #33): https://i-fiberoptics.com/pdf/if-e10.pdf
It contains an IF-D92 phototransistor and matching datasheet excerpt.
Simple, the mechanical drawing and the CAD file show the leads to be of equal length, yet the photo that @probability_density presented showed one to be longer than the other.
What I explained in post #4 is true no matter what.
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You've bought one ? On seeing the kit in this thread, I was tempted to add one to my shopping list even if just to get a component order to qualify for free delivery.
I never finished this off because it was an active thread and I did not feel strongly enough about it to continue with simply a distraction, but now anyway the OP has vanished, and this has been restarted, so why not.
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Well, I successfully completed a 2 year technical drawing course at school many more years ago than I care to remember and I would still recognise such a third angle projection scaled drawing when I see one.
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I find it unusual that a variable length, in this case, the component leads, are represented by a solid feature on the drawing and not a broken one such as in the two examples below. I've no idea now which ISO or whatever standard governs this and how universal it is. But, for me it is clear why, in this specific case, as explained below.
- Looking at the data sheets it is clear that that generic housing assembly in the drawing is used to encapsulate one of a large number of different 2 lead components in its recess. The manufacturer will not want to maintain a large number of different drawings depending on what exact component is fitted in that housing and may not even know what will be sourced in the future. Therefore, a generic drawing is used which is vague about the absolute and relative lead lengths, using only a table entry specifying a minimum length. Maybe that is done in a way which does not conform to all the relevant standards (ISO etc.). The is customized only with a simple addition outside the projection to indicate if the pins are anode/cathode or collector/emitter depending on the device type (diode or transistor).
I was making an order anyway and I figured for $8 it would be fun to play around with since it didn't affect the shipping costs for the rest of my order.