Joe O., Cevan & Cairo have it correct, & Ripper - yours are the same keys in all metal. All Porsches of that era came with the red & black key set.
Red = limited access "Valet Key" with the extra groove which disables the tumblers on the trunks & glovebox.
Black = Owners Key & works all locks
Both work the ignition
These were the same key sets as used for 60's-80's 911/912/930/924/944/etc. up to the later "fancy" & electronic keys. They're still available from Porsche in both types with the Porsche name embossed/molded into it, & in no-name plastic heads - as well as the all metal basic keys like Rippers.
Most dealers & Porsche parts sellers can get them for you, if not in stock.
FYI - 73 ad - the 3rd more "roundy" key is the Audi type - but I've never seen any of them in real life with "911" & "914" molded into them as the pic shows, so it may be a touch-up job, since both 911s & 914s got both a red & black key new in this trapezoidal shape:t
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