Inconsistent NBA Game IDs in Play by Play Data

[bfs6]

I am using the function load_nba_pbp to get seasons worth of play by play data. However, when I try to merge certain subsets of this data with other tables I have by "game_id", I realized that the game_id's in your play by play data is not consistent with the formulation of game_id that the NBA Stats API uses. Is there any reason for this or documentation for how these changes were made?

Additionally, is there any way you would be able to add an extra variable that could indicate the NBA Stats API Game ID, if game_id in your data is a sportsdataverse ID.