Go talk to your dentist about this. It looks like they fit into your teeth and are not mixed up. An x Ray would show this is correct. The longer tooth crown can easily be filed, shaped and adjusted so that it looks more like the adjacent tooth.
Hi:
The best restoration to protect the tooth after a root canal is a crown or onlay not an inlay. The cusps have to be protected against any fracture due to brittleness of the tooth after root canal.
Best,
Dr. Maddahi
Hi:If you do not get the crown recemented, you bite could change, tooth may get decayed over time and your crown may not fit. It is best to get the crown recemented as soon as possible.Best,Dr. Maddahi