How do I do a 2 pages A4 to A3 borderless tile printing seamlessly at the connection line?

It's a Canon TR 150 printer.

I have split the photo in half in Photoshop and printed out both borderless, but of course the connection line is not seemless due to the slight borderless cropping.

What is the best workaround for this?

It's not a problem if I loose a slight amount of the image on the sides, because it will be zoomed anyway, but it must be zoomed in the same amount for both pages so that the connection line will be flush.

This is for transfer for an A3 painting, so the frame boundaries are slighly smaller than A3 so that the painting can be taped on the back. 

Photoshop doesn't have a tile printig + borderless option, it's either / or, and the Canon Easy Print software for the TR 150 doesn't allow me to exclude cropping at the bottom / top of the image for the borderless printing, nor does it have tile printing.

I have used the Canon Easy Print software for printing that's at the software downloads for the TR150.

Basically the task is to print out both borderless at the same zoom ratio, with no cropping at the bottom and top, respectively.