Not quite. The 3080 mobile variant has the same number of CUDA cores as the desktop 3070. That doesn’t sound too bad in theory, until you realize at its maximum boost clock, it’s running at a lower clock speed than the 3070’s base clock.
In terms of features and CUDA cores, yes, that’s correct. Mobile 3080 is comparable to the desktop 3070. In terms of performance, it’s pretty abysmal. There are like 10 different power level variants of the mobile GPUs. The highest end mobile 3080 variant intended for those big chonky gaming $5000 laptops that are really desktops in disguise, at its maximum boost clock, is only marginally faster than the desktop 3070’s base clock.