Pin declaration of balanced input / output XLR

I need assistance in some clarification;

I tried a pair of MBL's 9008 A mono blocks in my system recently and did not like the sound. I had them hooked-up to my Audio Research Ref3 pre in balanced configuration, XLR. When I pushed the button on my remote "INVERT" I preferred the sound.

I just recently found out that MBL's XLR inputs pins are differently configured then my AR.

Pin 2 on the MBL XLR is Inverting and on my AR it is Non-inverting.

By pushing the "INVERT" button on my pre is this correcting this phase issue properly.

I asked about just swapping the cables and was told this would not work properly.

My understanding is to correct this I should just have an IC with one end which would be connected to the amp re-terminated. Swap Pin 2 which is Inverting to Pin 3 which is Inverting, is this correct.

I would assume the MBL pre-amp XLR outputs would be the same then so if connecting to any non MBL gear you would need to do this also or you run into phase issues.