Monitor 7b and 7c crossover

chrisw302

I ran across 2 monitor 7 speakers at goodwill today. Pulled the grills and one has a peerless tweeter the other has a sl1000. At first I figured someone had replaced one but after looking at the back found one is a 7c while the other is a 7b. I have a spare peerless tweeter that looks like it should fit right into the 7b (the one with the sl1000). Does anyone know if the crossovers are the same between these 2 tweeters? Playing them just as they are they don't sound bad but would be nice to have matching tweeters.
Thanks
Chris.