If I a played a Xbox Series X/S of a game can I play the Xbox One version on the same...

It's important to know which game your friend bought.

I say this because there are currently three versions of the Series X/S game. Gta 5 Online, Gta 5 Series X/S and Grand Theft Auto V (Xbox One and Xbox Series X|S).

If he has purchased Grand Theft Auto V (Xbox One and Xbox Series X|S), which gives access to the game for Xbox One and Xbox Series S/X, he can play online with you as long as he downloads the Xbox One version, so you and he will have the same save and can play online.

If he is a Game Pass Ultimate subscriber he can download the game in the Xbox One version and play with you.

I totally understand, however, the game has its own version that can be played on Xbox One or Xbox Series X|S and the 360 version game is not backward-compatible, even if we want to it is not designed to be played on the Xbox Series X|S console.

Both games use smart delivery, so can only download the Xbox Series X|S version of the game on the Xbox Series X|S. If you want to play the Xbox One versions, then playing on the Xbox One is your only option.

The One version of the game can be played on a Series S/X. The Series S/X version cannot be played on a One.

Hello Tameaka.
My name is Ezequiel. I'm an Independent Consultant and I'm happy to help you today. Great question, in the store you will find three versions of Hogwarts Legacy, one for Xbox One, another for Series S/X, and the Deluxe version, the Xbox one version you can play on any console in the Xbox One family, the Series S/ X only works on new generation consoles, and the Deluxe version comes with both Hogwarts for Xbox and Hogwarts for Series S/X game versions and exclusive content. Be very careful when making your purchase not to buy the Series S/X version of the game, this version is only compatible with the latest generation consoles. The version of the game Hogwarts for Xbox One can be played on Series S and Series X consoles, but you won't have the same graphics as the exclusive version for Series S and Series X consoles. If you have any questions, please contact me again and I'll be here to explain any other questions.