It can't hurt to ask. Who knows, maybe the dealer is in a situation where he could sell the 1850 to another buyer and provide a 2350 to you. The good thing is it has no wear or depreciation on it. As soon as you take delivery, the value takes a hit.
It is possible the 1850 would meet your needs, but I am going to disagree with a few others here and say there are times when the hp would make a difference. The question is, are you in any of these circumstances.
If you want to run a
chipper or a generator off the rear PTO, the 2350 will barely make it into the performance range of several models; the 1850 falls a bit short of meeting specs on most models. I have a very difficult time ripping duripan with my
BX2200 and a subsoiler; I bog down constantly. Only broomgrass slows my hd rough cutter, not even 2" sapplings slow it down. I doubt you need to drill into serpentine or harder rock, which would necessitate a good Pengo auger and specialty Pengo tip, but the hp would make a difference here as well.
If you never will want to run a
chipper or generator, never need to rip duripan, ironpan, or caliche, drill into rock, or brush hog broomgrass, then the 1850 is likely to do everything you need. If one of those circumstances applies to you, there is only one certainty: if you don't ask, it's for sure you won't get it.
Best of luck with your situation.