April 29 at Yankee Stadium. Book it now.

You’re going to see the most vicious, hellacious booing since the new Yankee Stadium opened in 2009.

April 22 at Fenway Park? Take it or leave it. Shouldn’t be much of anything.

First will come Jacoby Ellsbury’s return to Red Sox Nation in a Yankees uniform, and a week later, Robinson Cano will wear Mariners Northwest Green into The Bronx. That the two men are likely to receive wildly different homecomings underlines myriad truths about this still-stunning pair of address changes.

One is that Cano is a far better player than Ellsbury. Another is that the Yankees will miss Cano more than the Red Sox will miss Ellsbury because of relative roster depths.

Most of all at this point? Cano is off to a very rough start in his life as an ex-Yankee.

“Every one of us in our life, no matter who you are, has a decision often to make: Do I stay where I am versus go to another opportunity for a lot of money?” Yankees president Randy Levine said Friday, as the team introduced Ellsbury at a Yankee Stadium news conference.

“People understand that. That’s very reasonable. Nobody begrudges him. I respect him for making that decision.”

Of course, many, many people don’t understand that. Don’t comprehend how any human being could look at a seven-year, $175 million offer and interpret it as disrespect. Shoot, they can’t even get past the profoundly over-hated not running on groundballs thing.

Cano created waves by using his introductory Mariners news conference Thursday to lament his breakup with the Yankees.

“I didn’t feel respect,” he said of the team that signed him as an international free agent and developed him. “I didn’t get respect from them.”

The second baseman accepted a 10-year, $240-million offer from the Mariners. Ellsbury’s negotiations with the Red Sox, the club that drafted and developed him, got only as high as five years and $80 million before the Yankees — anticipating Cano’s imminent departure — got him to sign for seven years and $153 million.