gerrymandering actually only comes into play within the house. if the vote for the house was done by a purely popular basis without regards to districting and state boundaries, the republicans would still control the house. However, their majority would be far slimmer[1].

overall these comparisons are complicated as you often have situations where candidates from the same party compete against each other, or face no challenger

https://en.wikipedia.org/wiki/United_States_House_of_Represe...