While there are numerous experiments testing the Charge, Parity, and Time Reversal (CPT) symmetry, it is not clear how these tests are related with one another, and hence, if there is a reasonable way to compare bounds arising from them. In this talk, we focus on the Penning-trap experiment testing the charge-to-mass ratio of protons and antiprotons, and try to compare it with other experiments which also test the matter-antimatter mass asymmetry (MAMA) from a bottom-up approach. This is done with the help of the mass decomposition of hadrons. At the end, we found that the bounds from kaon oscillation experiments are many orders of magnitude above the Penning trap experiment for a set of MAMA parametrization. We also discuss the implications of a CPT violation signal from the Penning trap experiment within the kaon oscillation bounds by tracing back the origins of a non-trivial MAMA, namely the violation of locality and Lorentz invariance in an axiomatic field theory.