If you look at that 2012 City team Kompany, Silva and Aguero walk into last season's Arsenal side. Yaya Toure is marginal, the rest of that City team get nowhere near last year's Arsenal 1st XI.
Whereas if you compare Arsenal and City last season, Saka walks into the City team, there are several players that you could argue are on par on either side (particularly at the back, maybe Saliba is a smidge above what City had at CB last season but still marginal) but apart from the aforementioned Saka I don't think another Arsenal player is a shoo in for the City team of last season and some of the City side (eg Haaland, Edersen, Bernardo Silva, Rhodri, KDB) are absolutely clear above their Arsenal counterparts (Silva I put in even though he plays in Saka's position and I said Saka walks into a combined Arsenal/City team I just think Silva is so good (controversial opinion but I actually think he may be your best player) that a spot has to be found for him somewhere.
Actually if you offered me 1 current City player we could take to Arsenal it wouldn't be the 'obvious' choice Haaland - I'd take Silva ahead of him.