Regardless, the styling cues of the vehicles seem to blend in rather nicely, so perhaps this could pass as a real design to an untrained eye - pixel tip to the Unnecessary automobile nose swaps Facebook Group for this shenanigan.
Keep in mind that both the C5 Chevrolet Corvette Z06 and the Koenigsegg CCXR came with aspects that set them apart in the said eras.
For one, the 'Vette saw the Z06 badge returning after a long hiatus (this hadn't been seen since the 1960s, when it was born on the C2). More importantly, this incarnation of the C5 could one-up the C4 ZR-1 monster (it wasn't as powerful, but its ligther nature more than made up for that), with the exception of the top speed, while being significantly less expensive.
As for the CCXR, the Swedish automotive producer describes this as the world's first green supercar. And it's hard to argue with that title when the R derivative of the CCX added ethanol biofuel (made from biomass instead of crude oil) capabilities.
You see, the 4.7-liter twin-supercharged V8 of the machine delivered 806 hp on pump gas, but this rating jumped to 1,018 ponies on E85 (85% ethanol and 15% gasoline) - the ethanol, which this animal could also consume in E100 form, not only comes with a higher octane rating compared to gasoline, thus allowing superior boost, but also keep the engine cooler.
Of course, the contraption portrayed here can always be regarded as a mid-engined Corvette...