I had set of XA pedders s/h front and rear, also a set new BC coilovers, as far as I can remember in my old age is that external parts interchangeable. Series 1 and series 2 coilovers were different (upgraded) Then internal dampening rate may be slightly customised compared to BC, also pedders use their own coil springs on the XA coilovers,but pedders have limited spring rate options available. Good new is BC have a much better range of coil spring rates available at varying spring rates to further customise your pedders coilovers.
The rears have differences between the two, more thread adj and valve adjustment mechanism in series 1 vs series 2
The fronts are a different story, almost identical as to if the internal dampening is the same in both, you would need to put them both on a shock Dyno across the dampening range and check graph printed result, most of the avg to good quality coilovers come from the same factory in Taiwan, indonesia but are tweaked to suit different companies requirements, sometimes it’s what’s inside that counts.
I purchased my spares for my front pedders from BC racing, was cheaper as well
At the end of the day BC racing are absolutely comparable to the pedders XA , the difference is minor and better value purchase price, as too which are the better coilovers, I like BC as they let me customise my spring rate on purchase, whereas pedders said no, take it as is ?!,!
Also lots of pedders replacement shocks are rebranded Monroe units as well, painted a nice red of course.