IMO, probably.
More importantly, go with a supplier who has
reputation for quality products, and good support.
Name-brand engines (Honda, R/S, Mitsubishi, Tanaka) cost more for a reason. The company that put its name on that engine has a top-notch quality control system in place so that you can depend on getting a good engine. And, if by some fluke, there IS a problem with the motor, they stand behind that engine and will take care of any problem you had.
If you got one of the knock-offs, quality control is, at best, questionable. So, if a vendor is selling kits that use a knock-off, either he has to carry a LOT of spares and spare parts (costing money,) or, he doesn't support the kit, and you end up with junk if the engine has problems. Or, you wait for replacement parts to get shipped from the factory...
The other area that jacks up the price of some kits is the supporting hardware quality. As with anything else, quality costs more $, but saves the buyer in time and aggravation.
If you don't mind tinkering, and like to fix things, get a cheap kit. If you just want it to work, pay a little more up front.