The Maisto looks ok but has one major flaw: the rear wheel cutout is totally wrong (looks radiused in streetrod manner) - apart from that there are some differences compared with the b/w photo of the original car (above, had also a contoured bench seat !):
The Porsche has been restored in the 80's (?) which resulted in different wheels, bucket seats and different front trim and bumpers - this was the version made by Maisto.
In recent years, the Porsche factory bought it back for their own museum and restored it to - almost - original condition (apart from keeping the bucket seats and the modified front trim) - this is the Welly version, they even replicated the original license plates very close (the chromed "A" above the left taillight stands for Austria where the first 300 Porsches were built before the company moved to Stuttgart/Germany where it still resides today)