Why is hex uploaded different to that downloaded?

Using Arduino Networking, Protocols, and Devices
1

the hex I get back is not the same as the hex I send out can anyone say why?

Got back
:200000000C9434000C943E000C943E000C943E000C943E000C943E000C943E000C943E00FA
:200020000C943E000C943E000C943E000C943E000C943E000C943E000C943E000C943E00D0
:200040000C943E000C943E000C943E000C943E000C943E000C943E000C943E000C943E00B0
:200060000C943E000C943E0011241FBECFEFD8E0DEBFCDBF0E9440000C9456000C9400009B
:2000800081E084B941E02AEF30E045B988EE93E0F9013197F1F70197D9F715B888E293E2D3
:1000A000F9013197F1F70197D9F7EFCFF894FFCF26
:00000001FF

Sent out
:100000000C9434000C943E000C943E000C943E0082
:100010000C943E000C943E000C943E000C943E0068
:100020000C943E000C943E000C943E000C943E0058
:100030000C943E000C943E000C943E000C943E0048
:100040000C943E000C943E000C943E000C943E0038
:100050000C943E000C943E000C943E000C943E0028
:100060000C943E000C943E0011241FBECFEFD8E04C
:10007000DEBFCDBF0E9440000C9456000C940000DF
:1000800081E084B941E02AEF30E045B988EE93E0A1
:10009000F9013197F1F70197D9F715B888E293E2A2
:1000A000F9013197F1F70197D9F7EFCFF894FFCF26
:00000001FF

2

There are a number of different ways you can send a hex file.
It looks like it is encoding it on longer lines when you get it back.
See:-

I haven't looked at it all but it looks like it is actually the same data.

3

Looks the same, just a different starting address, and 4 'characters'(?)/line with a checksum vs 8 bytes