The only difference between GPL3 and AGPL3 is what constitutes distribution. With GPL3 you have to provide source to anyone you provide binaries. With AGPL3 you also have to provide source to anyone who uses the software remotely (eg a web app). Everything else, including the scope of what must be included in the source (modifications, linked software, but not software that talks over IPC, etc), is identical between GPL3 and AGPL3.

More specifically, the only difference between GPL and AGPL is section 13 (and the preamble summary). The rest of the license is word-for-word identical (save for the name). https://www.gnu.org/licenses/agpl-3.0.en.html#section13