Although in reality it is fairly similar to a CL604, there is no credit either way towards the ratings.
If you are having to go for a new type rating at your own expense to get the licence issued then steer well clear of corporate types. The ratings cost between 5 and 10 times those of airliner Types.
It does seem bizarre the company wanting the ATPL before you start, since you can get it as part of the type course you do with them for no cost other than the admin fee.