Gut and bows
I have the impression that modern players who switch to gut strings tend stick with the same bow. Has this been true for you? Did you find that you were as pleased with your old bow on the gut strings, or was it just that you could make it work and since the gut is just an experiment you aren't going to change bows to perfect the match?
I think it's completely fine to stick with the same bow, but there are also reasons to switch, provided the new bow has a couple of certain properties.
At least 3 of my bows (2 violin and 1 cello bow) were used on gut (and wound gut) strings for 20 years before synthetic strings were even a "thing."
I recently tried gut strings for the first time (thanks to Mr. Adalberto). I am really enjoying them and have noticed a big difference in feel and sound. I have also noticed that my F.N. Voirin bow has responded quite favorably. This particular bow has many wonderful qualities but has always been a bit thin and flighty with synthetic strings. I assumed it was an inherent characteristic of the bow or my technique. But now it effortlessly sticks and digs into the Eudoxas with predictable precision like never before. I cannot explain the cause for this effect. But I am loving it.
I don't really have the luxury of dropping 5k on a new bow, so I kept the same gear when I moved to gut. I have only one master bow that I use.
It is more likely that one would have a different, optimum rosin when switching to gut strings. Pirastro makes a different rosin to match it's long list of string brands. I have always considered that to be a marketing ploy to sell more rosin.