Yeah, why do people call it a rating? Single engine Cessna/Piper/Airvan. If you can fly one you fly them all.
If you get a job with someone they will most likley do a fair bit of ICUS which will satisfy insurance requirements anyway.
Have seen folks with barely 200 hrs and no time on anything with a 520/540 in it get jobs and others with a couple hundred 210 hrs struggle.
If your in the right place when someone needs someone and you are a good bloke or girl you will get the job.