The Auto Pilen catalog for 1971 clearly shows actual Corgi Mini Cooper & Olsmobile Tornado and a Dinky Detomaso Mangusta which shows the company´s own brand new castings were not ready when the catalog went for printing. Monza may or may not be an original Tekno and Mercedes 250 maybe an original Mebetoys.Chevy Astra looks like a Corgi from the colours - I have the Pilen version which is an amazing copy which doesnt appear to come from Corgi tooling.
The Pilen Monza is very similar but not identical to the original Tekno.
Were the Danish molds modified or just copied? The Pilen versions have a longer baseplate that covers more of the front and rear of the car, plus the rear engine cover does not open as in the Tekno (and Joal) versions. Auto Pilen as well as Espana and Escala 1/43 are now on the baseplates. They came with and without a hole in the baseplate, to attach it to the clear plastic box in which Pilen cars came in the 1970s. Before that, a cardboard box was used.
Joal were competitors not associates of Pilen as far as I know,and I have seen no evidence that Joal shared or sold on the Tekno tooling to Pilen or anyone else however we can see from the catalogs that these Spanish companies often chose to make their own versions of castings already locally made by a rival although French Dinky tooling did also go to Spain once the French Dinky production shut down.