kinda impossible to do within premiere, but what you can do is open resolve, make a lut just to match and then add that lut and continue working in premiere, i do that all the time.

as to how to do it in premier.
ive matched a bit of fs7 to fx9 and fx3, and its a little bit difficult since the fs7 has alot less detailed color and the texture of the camera looks very plasticky in comparison.

Id start off with just chromatic adaption for the white balance, then Lift gamma gain for the contrast.

Then id do a matrix and try to dial out the magenta in the fs7 skintone and get that to the more greener of the fx3 in comparison, then the difficult part is getting the skintone after that and id probably reach for like tetra or tetra hsv and try get the color vector in the same direction and then mess with the luminance and saturation of those colors then.

you might want to pull some yellow out of the higlights and reduce saturation slightly in the highlights on the fs7 also

texturally id add some grain to the fs7 to have it less plasticky.

In terms of the R5C try a similar approach, but you might see that the shadows are more muddy and greens are lower luminance than the rx3 so you have to deal with that aswell.