Thanks.
Yes, I saw that detail too. But this one does not rule out the possibility that is the same actress.
This kind of close-up is frequently filmed in a different setting for better quality.
Furthermore, we can imagine that a sheet was needed to cover the sofa and hide the emptiness between the cushions.
I looked carefully at the close-ups and the actress's anatomy is very compatible with Irene Wendlin's anatomy.
Not so uncommon at the time.
There's many cases of actresses in the late 70's/early 80s that would ride the line between hard and soft who participated in explicit scenes (handjobs, licking but no actual viewed blowjob, long shot hardcore) but wouldn't sign off on close ups or money shots.
Hardcore closeups and money shots would be inserted into these scenes for Export release.
First example off the top of my head is
Zaira Zaccheddu in Gocce d'amore
https://www.egafd.com/films/details.php/id/g00016
It says softcore performance but the scene in question, it's clear she gives a handjob and the hardcore longshots with penetration are absolutely her. The close ups and money shot however are clearly inserts.
All this was due to the varying laws regarding pornography across different countries.
Generally movies (especially European) were made in 3 versions...
-Softcore versions generally referred to as the UK versions due to strict porn laws in the UK at the time
-Regular versions involving longer scenes of nudity/spread shots, possibly genital contact and even longshot hardcore that were filmed more "artfully" lol
-Then you had the the Export versions that had longer scenes and if those scenes were deemed to be not explicit enough, full hardcore no face shots would be inserted to spice it up more.
-Technically there's a 4th version sometimes where films were shot completely hardcore but only released softcore and the HC version were not released for years or even decades later. Some examples are Flossie, Butterflies, The Danish Zodiac series of films and Alice in Wonderland the Musical.
Alice in Wonderland is one of the craziest examples of this as there were always rumours of hardcore during its filming but that material (full version of the film) took almost 30 years to be released and this of course was after Kristine DeBell had spent those 30 years vehemently denying any involvement in any hardcore material lol