If it looks like an ugly version of the original murcie it's a g24
G28 is lp640
The kit must be a really old version tho things are very different from the current g24 being made
Since you're building, it really helps a lot to look at thousands of pictures of the real car
You should eventually know the car inside and out imo
regardless of g24/g28, buy it as long as you like it, not sure why it matters if you can't tell them apart?