I don't trade them, so no idea if they all are at same price. Pleaes chk their latest quote from NSE site.
As per underlying concept of ETF, once fundhouse has collected the moeny, then it is very similar to mutual fund. Like each mutual fund has its purpose where they invest the collected money, same is true with ETF.
Some of these ETFs might be investing in Physical gold, whereas other might be investing in stocks of Gold related companies.. They might have different % allocation to cash/gold/debt etc.. So their prices might be different..
Happy Trading