It's only the difference of a single word in the messaging between the two preparations in both first person and third person.

Sanskrit 'mantra'; literally ‘a thought, thought behind speech or action. Sounds pretty non-physical.

If that one word is a deal breaker, Premium LTB, Hollow Eve Festival or Throne City Spell Library spell preps would give you another prep option. They'll also require 1 (or 2) magic feats.

Train stealth and you can hide your prep from people with lower skills. Prepare /Hide

If your Front End supports subs, sub in prayer for mantra and save yourself the trouble and cost of the above options.