Vashishta and reax/c potential

I used metal units when creating the amorphous alumina with vashishta. Then when switching to reaxff, for which I used a different script, I specified real units.
Should i use a restart file and change the potential and parameters by re-declaring the units,pair_style and pair_coeff commands with the reaxff arguments instead?

it'll be cleaner to generate a data file and use that.