ROM Hack Overlay recompression?

[Butterhands]

I found a guide to hack the move tutors in HG/SS to make them free or decrease the price, but I can't recompress correctly the overlay file, also if I try to recompress the original file untouched the compressed file is different and if I re-insert in the rom the rom don't work. There is a decompressor/compressor that could use the same compression algorithm? Crystal tile 2 and BLZ didn't work correctly.

 

[Butterhands]

Fixed myself, Crystal Tile 2 recompress it in a working way if I leave it directly injected and I kill the CT2 process, 'cause if I close it save again the rom burning it.