Connectors from playfield to game would be different.

LTG : )

Hard to tell. They look the same as far as scoring and text. But I know The EM Charlies Angles is different from the SS.
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^^ EM

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^^SS

By the time of Joker Poker, the playfields were different because of the bonus multiplier. See the numbering in this photo:
https://www.ipdb.org/showpic.pl?id=1306&picno=47848
The SS playfield has 5X bonus while the EM has double bonus. That doesn't seem to be the case with Cleopatra, though.
.................David Marston

I own an EM Cleo. Can confirm: SS and EM playfields are identical. Even coils on the EM are DC rectified.

Under the playfield wiring, however, is very different.

One game earlier, in Sinbad - double bonus vs. 5x

The playfields are the same. There is one minor difference, the background around the bonus area on some are yellow, while others are a olive green. My guess is the yellow background was used on the 2 player version Pyramid, while the 4 player used the olive green version.