So... Time to get out some casts. And some measuring tape!
In this angle/distance the 997 appears bigger already so it could be some illusion anyway. Let’s start with the 911S.
According to Carfolio it’s length is supposed to be 4163mm. I didn’t have my digital caliper at hand so this is the best I could do but by using the box to delimit the position/lines I think I came pretty close/accurate: 65.3mm. Making it’s scale... 1:63.8. Pretty close!
The 997 is supposed to be 4435mm. A you see I measure it at 69.3 mms, making it a 1:63997 (hahaha, really!!), even more close. But with measuring this inaccurate both are correct I suppose. And both @ep3_lol and @hws_dukeofdiecast are right: it’s mainly the angle that made the difference little less visible. From above:
And that’s it for today. Or should I do the 930 MBX? Well, with those rear-bumpers I wouldn’t know what to measure: With or without those (I suppose) USA bumperettes... Tschüss!!