Last two ingredients might be the difference. First three is a gimlet - assuming the lime is cordial rather than a slice. Lots of mixing of gin and Cointreau or Grand Marnier too. One of them is a sec, though they taste similar to me.Gin, lime, soda, triple sec and grenadine. Does it have a name or did I just invent something?
I inherited an old cocktail book from my pal Gazza (a legend in his own lunchtime) - not the footballer. It is interesting to see some of the ingredients specified. Creme de cacao for example, which I have never seen on a shelf, and old fashioned stuff like Advocaat and Dubonnet (one time favourite of royals).