Hi!
Are the hex files specific to the mcu package?
I have a design working properly on a breadboard, with an atmega368p can I use the same exact hex file on an atmega368 smt 32 pin (atmega368au)?
Does the hex file designate the specific mcu?
Thank you!!
You should be fine. The text after the basic part number ATMega368 generally specifies the package and/or the environmental range, which will not have any effect on the code.
HEX files are not MCU specific, the contents may be.
Be aware of the different device signatures; you will need to adjust the avrdude command to cater for the 328 instead of the 328P.
Depending on what you mean by basic part number 
The P immediately following 328 stands for PicoPower.
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