So they are defacto the same? And probably Maggie's views on it would have been more nuanced than you first suggested? Shed like the EEC bits not the others?
I imagine she would have supported the economic union (EFTA/EEA etc) but she opposed the political union and any legislation related to it in the House of Lords, so I think it's a stretch to say she'd have been a supporter of Remain.
Who knows 🧐? I said her views on the EU rather than leave remain being more nuanced than you suggested originally which from your replies seems to back that idea up.