Agree - these are sometimes sold in Murano as well.
Bob Hall in his "World Paperweights: Millefiori and Lampwork" shows a pic taken on a visit to Murano
of many chinese weights being sold as Murano.
Sad state of affairs.
A good clue to nixing a Murano attribution is to look to the base - bases are almost always well polished on 20th Century Murano weights. Antique ones can show pontil marks.