Difference in Monitor 10 crossovers

The venerable Monitor 10 speaker has been around for a long time, with many variations. I have a pair of late 80's produced 10Bs. I purchased a pair of crossovers for 10Bs, and lo and behold, they aren't the same as the ones in my set. I've compared with other images on the web and the one's that I purchased are 10B crossovers, and certainly, the one's in my set are 10Bs as well. So, it appears that Polk made some adjustment or improvement along the way.

My question, is there a significant difference between the production variants that would make one set more desirable than another? I plan to have the crossovers refreshed and upgraded, but which pair do I start with? And, oh by the way, I've installed RDO-194s and new MW 6503-8 drivers. I'd really like to end up with a "new" pair of Monitor 10Bs!

My next project will involve doing the same to my SDA-2s.

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