When particles mass can be changed by changing the website, then how to calculate with confidence?
For example: Google: electron mass = 9.10938 188 × 10$^-31$ kilograms
Wikipedia: electron mass
9.109 38 2 15(45) ×10$^−31$ kg
5.485 799 0943(23)×10$^−4$ u
8.187 104 38(41)×10$^−14$ J/c$^2$
0.510 998 910(13) MeV/c$^2$
The difference is small, but it makes little difference in accuracy.