This is simply not true regarding the engine. Initial reports, like the Car and Driver article from Oct 2017 titled " a tale of two 2 liters", indicated they were similar:Same engine, trans, different tuning and I think a smaller turbo. It's tuned for 87 octane while the CTR is tuned for 91
However, it later came out that the engine designs and related systems were different even though they have similar architecture: https://jalopnik.com/heres-exactly-what-makes-the-2018-honda-accord-and-civi-1820164645
Key differences are below (with the most obvious being the fuel system and turbocharger which will limit power potential):
Turbo charger and related items
Other little things here and there
I also think I read somewhere the head design is slightly different (more tumbling effect for the R I think?) but I could be mistaken
Also Accord 2.0 sport doesn't get an LSD, so drive train is different as well.