Several GnuPG instances, with their corresponding agents

[Konstantin Boyandin]

Hello,

I am currently using Ubuntu 18.04; the "built-in", provided from
standard repository, GnuPG version is 2.2.4 (it can't be simply
removed/replaced by manually built version).

I would like to use, whenever I like, manually builds (such as current
2.2.13).

Question: how do I keep several GnuPG versions installed, every version
with its own gpg-agent?

Thanks.

Sincerely,
Konstantin