Confusion with pip in python 3.7 and 3.8?

Question

Python

There are several questions on this topic at once:
1. Provided that both 3.7.4 and 3.8.5 are installed, the pip --version operation checks the version of 3.7. Do I need to install a different pip for each version?
2. Does the pip3 install package command install the package for 3.7 or 3.8? If for 3.7, can this be changed?

Answer 1

(Tired)
pyton3.7 -m pip install
pyton3.8 -m pip install
I hope you at least know about the virtual environment?

Answer 2

If for 3.7, can this be changed?

In the Path variable, specify the directory with the desired version