Mind of tempest
(he/him)advocate for 5e psionics
no, if all spells work the same is good.The argument for highly similar magic is internal consistency: if all magic works the same, it's much easier to account for it in the rest of the setting and rules, so you lose potentially a little flexibility in one place for a lot of gains elsewhere. In theory.
most of the difference between magic is how you relate to it, divine you working for a being, arcane your harnessing something they should have some rules to reflect it.