You might ask on the Home Decor forum. I know a lot of posters over there have used Ivorie. From pictures I've seen, Jersey Cream appears to have a slightly "sunnier" yellow appearance.

Jersey Cream is a yellow. Ivoire is a creamy beigey color.

I had a thing for Jersey Cream for a while - interior and exterior. It's a really good answer for people who say they definitely want a yellow. JC behaves as yellow typically does. Doesn't look like much *yellow* on the chip but once up on all four walls you have lovely soft yellow -- not the standard expectation for "cream".