In your first picture you can see the width of the parting line just below the main bearing. That's a forged steel crank. If it was cast, that parting line would be very thin.
I find it easier to look at the counter weights instead of the parting line. I can tell at a glance by looking at the weights.
When in doubt , stand it on its end and tap the counter weight w/ a small ball peen , cast=thud , forged =ping----------
newer aftermarket forged are cleaner looking than old OEM ones, can tell by full fillet bearings too. Cast usually have back cut bearing surface corners too.
