Can I use LIR927 instead of CR927?

No. Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.

What voltage is CR927?

CR927 is a 3 V lithium cell with a typical capacity of 30 mAh.

9.5 mm across and 2.7 mm thick.

CR927 is sold under that code alone in this chart.

CR927 at actual relative size: 9.5 mm across, 2.7 mm thick. The dashed circle is a US quarter, 24.26 mm across (US Mint coin specifications).

These are the same size or a similar code, and they are not equivalents.

LIR927
Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.

Used in wristwatches and a variety of LED art. Also used in some Lego toys.

Can I use LIR927 instead of CR927?: No. Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.
What voltage is CR927?: CR927 is a 3 V lithium cell with a typical capacity of 30 mAh.
What size is CR927?: 9.5 mm across and 2.7 mm thick.