Top one could be Vasart... then so too could the second which would make that an early Vasart when they still had the original Kugler colours available.
What makes you think they could be Vasart rather than Monart Frank.
I can only discuss the purple and white bowl as it is the only one I own.
The base finish is the same as number 4 in the link below, which is listed as a Monart type base finish. To date I have not seen a piece of Vasart with that type of base finish.http://www.ysartglass.com/BaseLabel/Bases.htm
Also the link I provided in a previous post showing a Monart labeled IG piece which is the shape as the purple and white bowl.