I did this with the BC line when they came out. Got a Mistura, loved it so much went back and ordered one of each.
Thanks. Decided to go with the Extra IT as my boar purchase. Ultimately, I wanted the shorter loft but really didn't like the 610 handle dimensions. And I haven't gotten to a point yet where I think I could appreciate the Mistura.For me it's the Torga-C3, I love the 610/620 handle but that extra 1mm takes that knot to another level, so far, for me.
That extra 1mm make it a little denser and with more backbone.
I think I have not used my Torga-C3 Extra IT Boar as much as my Semogue 620 and or 610, But this is clearly my take away using the 3 brushes.