Idk its maybe dumb question but can i use 1.14 1.14.2 in 1.14.3?
Maybe. The only way to be sure is to try it. Since modded 1.14 is brand new, we don't have any info related to your question.
"We live on a placid island of ignorance in the midst of black seas of infinity, and it was not meant that we should voyage far."