It all depends on how you do the bleed.
In any case a quick burp after installation usually helps firm the bite.
Have done Euro to UK swaps and didn't have to do a proper bleed, just a quick burp.
quick burp
What does this look like? Pushing the pistons in to force any air up in to the reservoir?
Put the bleed cup on with a little fluid in and repeatedly squeeze the lever, tap the hoses and force the bubbles to the top. If that fails you can tie the levers down for a while but a couple of hours is usually plenty rather than days
@Polygon started
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It all depends on how you do the bleed.
In any case a quick burp after installation usually helps firm the bite.
Have done Euro to UK swaps and didn't have to do a proper bleed, just a quick burp.