Is there a big difference between 1900kv and 2050kv
 

I'm looking to be the tekin Gen 3 combo and the only one that is in stock is the 2050 kv combo for ebuggy. If there is not a big difference. I'm going to order it

I don't think anyone has tested the G3 series yet, they are supposed to be far more efficient, but generally you'll get 2050KV / 1900KV = 8% more power and drain your battery 8% faster... you can also dial back your EPA to 92% to get fairly close to the same feel of the 1900KV.

The 2050 motors I believe have a different style of stator wind which makes them very torquey compared to the 1900kv. I believe the can is a bit longer as well which makes them difficult to fit in some buggy chassis. The 2050 motors I understand are designed for Truggy and 1900 for Buggy.
Its been a while since I ran eBuggy and eTruggy but that is what I remember is the case.

Definitely compare the dimensions (length specifically), if it's the longer / heavier motor as dan_vector suggests, you'll want to wait for the 1900kV one.

I do have options this year thou been running a Tekin T8 4038 2000Kv in my 8E4. Dropped some weight not a huge amount.

Other than that I usually run 1900Kv. Between G2 and G3 they are the same length. T8 4030 buggy and T8 4038 truggy is where the length changes.

1900kv is wye wind and has smoother more linear power band. 2050 is delta wind and will be softer on bottom with strong mid and feel more like a nitro motor. I prefer the 2050, but primarily race nitro.