How is Cassiopeia's gameplay compared to the old Urgot?

Ever since the Urgot rework I've been wanting to play him (the old one) but his new playstyle doesn't even feel right to me. However, after constant frustration against many Cassiopeias I started realizing why she's able to spam her point and click ability, I'm guessing it's because of that circle thing she has to land.

By the looks of it, her kit is VERY similar to the old Urgot.

Her Q poisons the target after a short delay (almost like Urgot's lock-on mechanic). Her W slows enemies and grounds them for stepping on it. Her E is essentially like Urgot's old Q, where it refunds some of the cost if it kills a minion, where in this case it's the full cost. And her ultimate is also a suppression.

My question is, (talking to people who've played Urgot before his rework and Cassiopeia) is Cass's playstyle similar to old Urgot's playstyle? And if so how close do you think they are. Not only this but could building Frozen Heart be just as effective if there's no tank on the team, since she starts tear just like Urgot used to? Every time I get into my champion page I always see my Mastery Level 7 Urgot and just wish I could play him again, but if this is true I might as well settle for this.