A quick side note on inks for fountain pens: some ink mixtures are optimised for the capillary system the pens have. Or the other way round; chicken, egg… Viscosity, size of the pigments or whatever. I’ve noticed this with OMAS inks and pens and, to some extent, with Montblanc.
Bottom line: of course you can more or less use any ink with any pen without breaking it, but the flow of the ink may be not as one likes it and/or the pen needs to be cleaned in shorter intervals.