This is where real synthesisers differ from emulated synthesisers.
In the real world, not only does e.g. an SEM and ARP2600 have completely different feature sets, they fundamentally sound different, and that's why you would choose one over the other for any given task. Many of Arturia's synths are built around the same TAE engine, so they share a 'house' sound that's kind of like the instrument they are emulating but equally just as like the other in-house TAE instruments. So it becomes less of a case of choosing to use an ARP2600 instead of an SEM (or vice versa) because of its inherent sound character and more a case of using whichever VST has the features you need in order to realise the sound you envision in your head.
The exceptions to this rule are the newer synths introduced from V Collection 5 onwards, but pretty much all Arturia's legacy synths found in V Collection 4 and earlier (Mini V, ARP2600, CS80 V, Jup-8V, Matrix-12V, Modular V, Prophet V, SEM V) all fundamentally sound the same, other than they have 'model specific' features which differentiate them.