328 3v 8mhz boot loader

I am trying to bootload the pro mini 8Mhz board onto my 328 with a tinyusbavr but I get this error:

avrdude: verification error, first mismatch at byte 0x7980
0x21 != 0x88
avrdude: verification error; content mismatch

I have no problems burning the regular UNO bootloader. I tried doing it on the arduino board and on a breadboard with different combos of 3/5v and 8Mhz crystal.

Any advice?

Thanks.