Not exactly weighing in on either side, but the better comparison might be the World Series. In the 9 game 1912 WS that the Sox won 4-3-1 over the Giants, Smoky Joe Wood pitched 22 innings across 3 starts and 1 relief appearance Hugh Bedient pitched 18 innings over 2 starts and 2 relief appearances, Buck O'Brien started 2 games pitching only 9 innings, Ray Collins pitched 14.1 innings over a start and a relief appearance, and Charley Hall threw 10.2 innings in relief.
The Giants had 2 pitchers start 3 games each and throw 28.2 and 23 innings, another guy start and complete 2 games, plus 2 guys each throw a 2 inning relief stint.
So the Giants had a three man rotation throwing complete games (including extra innings) and the Sox had 2 men in a three man rotation plus a couple guys filling in, with the same starters also relieving each other.
https://www.baseball-reference.com/postseason/1912_WS.shtml