Energy Reserve (Biological) ... valid?

[Phantasm]

I've been working on a character for my Reboot project (sorry, not going to say which one... yet) who has a number of abilities with the Biological (-10%) power modifier from Powers. For reference, Biological contains a clause of "Costs 1 FP per use (-5%)" as part of the power modifier.

Now, it's also accepted that Energy Reserve can substitute for FP in such cases when it comes to magical energy (spellcasting in any form) and powering psionics that call for energy use to use.

My main question, though, is can I use Energy Reserve (Biological) to sub for FP for such things as Striking ST +8 (Kicks Only, -60%; Biological, -10%) to keep the character from wearing out as quickly during a fight (from loss of FP)? Would there be any real difference conceptually between ER (Biological) and FP?