How so? The European allies have advantages compared to global, being the extra boats and units that can get to egypt, plus a higher income Russia, and the extra anzac dude (not that he will matter much but still). In a global J1 war dec Japan will be facing an 80+ IPC US for the first 2-3 turns, not to mention on turn 1 he will face a 52 IPC purchase instead of the pacific only pathetic US1 buy, and an angry bear in the north with nothing better to do than to beat on him. Add into that the fact that in global the India crush can be delayed to turn 4 thanks to the boats and sea zones, and that the US should have naval superiority by turn 3-4, and its not lookin good.
Around the time Japan manages to capture India, china should be ramping up to retake all its territories, and the US should have the home SZ blockaded. Also while it is tempting to pump out 10 J tanks in India each turn, if UK holds and japan’s back is broken thats 10 UK tanks heading out of India each turn. Well more like 10 UK mechs, but still.