The PL will mirror their rules to that of UEFA otherwise it puts English teams in Europe at a disadvantage if Real Madrid, PSG etc can spend what they want whilst our clubs can not.
Not sure why you think this would favour Everton.
To be clear, the new FFP rules DO NOT apply to Everton currently because FFP only applies to clubs in European competition.
The new rules state that wages applicable to the squad and coaching staff plus player amortisation costs less player trading profits cannot exceed 70% of turnover on a rolling three year basis by more than €30m. For a transitional period, the thresholds will be 90% and €60m respectively.
Plugging this into Everton‘s accounts for the 2019/20 and 2020/21 seasons (and using Swissramle’s rule of thumb that playing and coaching staff are generally 90% of total wages), the ratios for Everton are 111% for 2019/20 and 120% for 2020/21. Even at 90% and with €60m leeway, Everton would not even be close to complying with FFP.
if you want to check my workings, for 2019/20, total wages were £164.758m, player amortisation was £99.232m, player trading profits were £40.465m and turnover was 185.882m.
For 2020/21, the respective figures are £164.313m, £81.243m, £13.226m and £193.143m.