I don't see how not sure that being allowed 70% rather than 60% of American's strength in capital ships by the WNT would have helped them.Moffett argued those %s and he WON... fortunately. The USN negotiators at the LNC 1930 were not as good, but they still got the State Department fools to cap the cruisers to handicap IJN fleet command ship slots, thereby surface action groups available, and hobble IJN aviation at sea with weak fleet screens for CTFs, (Fleet Problem XIV lesson learned), thereby.
OTH because the Japanese were Lizzy Drippings when it came to telling the truth about their warship's displacements makes a lot of difference in the carrier battles of 1942.
This is because it increases the Japanese quota from 81,000 tons to 94,000 tons. IOTL the 2 capital ship conversions consumed 53,800 tons and the Japanese used the 27,200 tons that were left to build Ryujo, Soryu and Hiryu, which the Japanese said displaced 7,100 tons, 10,050 tons and 10,050 tons respectively, which were fibs of pavarotic proportions.
70% of 135,000 tons is 94,500 tons. That increases the tonnage available after the capital ship conversions were completed to 40,700 tons, which they would use to build 4 ships with an official displacement of 10,175 tons. However, the first pair, built instead of Ruyjo would be Soryu class with a real displacement of 15,900 tons and the the second pair built instead of the OTL Soryu and Hiryu would be built to the Hiryu design and displace 17,300 tons.
If that was the only change between OTL and TTL between 1922 and 1940 it's likely that the 2 ships built instead of Ryujo are part of the Kido at the end of 1941 and take part in the raid on Pearl Harbour, the attack on Darwin and the Indian Ocean raid. I think they'll be refitting during the Coral Sea, but both ships will be at Midway and add another 108-126 aircraft to the Japanese air strength. I'll be prudent and say that Akagi, Kaga and Soryu are still sunk but the other 3 Japanese carriers and most of their aircrew survive. Yorktown is still sunk but the other 3 ships survive. The Japanese probably win the Battles of the Eastern Solomons and Santa Cruz.
However, before anyone points out the obvious. I know that the Americans would have out built them by 1944 and it doesn't change the outcome of the war. However, they might not suffer such heavy losses at the Philippine Sea if the Hiryu, ALT-Ryujo and the 4th ship survive to take part in it. If they survive that I doubt that they will be at Leyte Gulf, because there won't be the fuel or enough trained aircrew. Though having written that, they might take the place of Zuiho, Chitose and Chiyoda.