UPDATE 1-Comcast/NBC deal to have regulatory baggage-rivals

* NBC bid makes sense for Comcast - News Corp's Carey

* Deal to have significant regulatory baggage - Carey

* Regulators not likely to ask for asset sale - Carey

* Deal will cause "enormous debate" - Liberty's Maffei (Adds Liberty Media CEO)

By Yinka Adegoke

NEW YORK, Nov 12 (Reuters) - Executives from two top media companies on Thursday cautioned that Comcast Corp (CMCSA.O) could face serious antitrust questions if it were to acquire control of NBC Universal.

News Corp (NWSA.O) President Chase Carey and Liberty Media Chief Executive Greg Maffei, in separate presentations at a conference, both said such a deal could prove a winner for Comcast, but also raised concerns about regulatory hurdles.

Comcast and General Electric Co (GE.N) are in talks to on a deal that would give the cable operator a 51 percent stake in a $30 billion NBC Universal joint venture, according to people familiar with the discussions. Comcast would contribute its cable networks and $4 billion to $6 billion in cash.

Carey, the No. 2 executive at News Corp and a media industry veteran, said he would be "stunned" if such a deal did not encounter "fairly significant regulatory baggage." News Corp itself is said to have previously looked at NBC Universal but has since backed off, according to media reports.