I have found some overlap with the two mods, both have a creosote fluid that can't be used interchangebly

Create: TFMG, from what I remember, is a bad Create addon and not one I'm interested in supporting. I'll look and see if it's improved - and add compat if so - but I am uninterested in adding compat for low-quality mods.

TFMG has fixed several of the issues I had with it, but I have separate issues.

Additionally, in this case, this is on TFMG. They're not using tags for their recipes - at least for fluids - which would natively add compat between IE and C:TFMG. If you want this to happen, I suggest asking them to support Creosote tags in their recipes.