I’m looking to purchase the SPY500 ETF. But I’m looking at an accumulating ETF instead of a dividend ETF, does this mean there is essentially no difference if i buy SPY500 on NYSE compared to on the LSE?

I believe u mean the s&p500 etf, there are a different variety of companies that offer these etfs, spy is just the most famous one from state Street. What majority of investors here recommend would be Irish-domiciled accumulating etfs, like CSPX or VUAA. There are no accumulating etfs listed in the US.

Also, do note that there will be dividend tax no matter accumulating or distributing.

I don't think there is any SPY500 accumulating ETF in NYSE. Pls correct me if I'm wrong.