I have a Tascam br-20 that has almost new stock heads, (53783018) but I also have a spare set of brand new heads from a Tascam 42B (53783023) both heads are Rec/Play type so my question is of the two, which one is better sounding or are they equal, I notice that the BR-20T uses the 42B type head, (53783023) and would it be worth swapping for better quality recording & playback.