[Gupta]

In a nutshell:
Most probably streaming compression,
If i can recall it correctly there is option '--no-crc'
In commandline version if not play around with the api ur self, if don't wanna do it either use diff bt remember if diff are too big it doesn't make sense to use it, try to reproduce dumps as near as possible
I myself will play around with streaming api,,, they are well documented and very easy

If u r sure lz4 is giving you original dump just not with the crc , log them and append them to dumps yourself and then inject them