It's really unlikely you'll be able to find a sink that exactly matches your existing cut-out. Sadly, you will probably also have to re-do the countertop.

There are a ton of posts on this forum by @Joseph Corlett, LLC. He specializes in exactly what you want to do. There is no need to re-do the countertop. He also has posted how he frequently changes out the double-bowl sink for a single-bowl apron front sink. It looks really great. Here is a link to one of his threads, but there have been many.

https://www.houzz.com/discussions/4454249/apron-sink-retrofit

How fussy do you want to be with how the replacement sink fits please?

Sure, the positive reveal is off a tad, but for the money saved, apparently lots of people don't mind. If the stone covers the flange, it will be unnoticeable.

If the bowls are uneven, you'll most likely need a cutout change. A top mount sink with a cutout change is less expensive than an undermount with a cutout change as the latter has to be profiled and polished, the former does not.

We never pull tops to change sinks; the cabinet front is tapped off if need be. You can undermount a 33" sink into a 33" cabinet. I've undermounted 33" sinks into a 27" cabinet.

Please post a picture of your sink taken back far enough that I can see the countertop on each side and the drawer below. Include the cutout dimensions and the distance from the cabinet (not the drawer) to the furthermost point of the cutout and I'll make some suggestions.

IMO neither are an upgrade why not look for a good quality single bown stainless one instead and you might get lucky with the size . Joseph is the expert on this subject .

Thanks everyone! I’m not all that fussy if the fit is close. The area that’s tricky are the corners. Stainless bowls seem to have a much wider diameter than the white sinks I’ve researched…. White is preferred because we like the look.

The radii don't match, nor the reveals.

That looks great! Yes, it’s the corner radius I was concerned about the positive reveal, but you don’t really notice it above. I wonder if white would be any different (shadows). Current sink is 30x16… no pics until I’m home later…

If I thought something was really horrendous, I wouln't do it, no matter the price or customer insistence.

Thanks Joe! Any advice or recommendations on material or manufacturer?

Having some trouble even finding a sink close to this cut out…

I'm an Elkay fan for composites.

You'll have to change your cutout.

Okay thanks… I had previously purchase/returned this sink. The template was way off, which made me realize I may have no choice but to cut.

Elkay Quartz Classic ELGRU13322WH0 White Single Bowl Undermount Sink