Can I swap a MLCC for a tantalum capacitor?
Without specific information on a particular appliction, the only possible answer is "no".

For one thing tantalum capacitors are polarized whereas the ceramic is not.  The tantalum will also have significantly higer ESR, lower ripple current tolerance, lower temperature tolerance, and possibly much worse consequences if excessive voltage or reverse voltage is applied.

If you know how the capacitor will be used and stresses it will be subject to, then possibly the tantalum could be used as a replacement.  You haven't given us any such specifics, and in the general case you certainly can't replace the ceramic with a tantalum, so the answer is still "no".