What is the difference between these two coins?

https://en.numista.com/catalogue/pieces1888.html

https://en.numista.com/catalogue/pieces5972.html

From what is in the catalogue, seems just 1 gram in the weight, but with the the same dimensions and material.

Thanks ?

Either look at the comments or the pictures of the obverse of the coins (the large pictures) the differences should become obvious.

Yes, the updated third version of the coat of arms which has the word 'Romania' instead of the letters 'RPR' written on the bottom of the coat of arms is used on KM#93.

One coin is from 1960 while the other is 1966.

The full name of the country changed.

One is from "REPUBLICA POPULARĂ ROMÎNĂ" (Romanian People's Republic), the other from "REPUBLICA SOCIALISTĂ ROMÂNIA" (Socialist Republic of Romania).