The Nemesis is a Gallente ship, and they are generally Armor/Hull tanked.
The Manticore is a Caldari ship, and they are generally Shield tanked.
Different Empire faction ships utilize and rely on different types of tank, both of which consume differing amounts of PG and CPU.
Shield tanked ships generally have greater midslots and higher CPU fittings to allow people the chance to fit more shield tanking modules. Armor tanking ships generally have greater lowslots and higher PG because armor tanking generally consumes more PG. That difference is what makes each ship unique. If you want the Nemesis to be exactly like the Manticore, just fly the Manticore.
Nothing about the ships requires that the exact same fit be perfectly translated to each of the ships.
Now you’re just trying to move goalposts and derail the original topic.