Is 5011LC the same as CR2430?

Yes. 5011LC is another code for the same cell: lithium (Li-MnO2), 3 V, 24.5 × 3 mm.

Is DL2430 the same as CR2430?

Yes. DL2430 is another code for the same cell: lithium (Li-MnO2), 3 V, 24.5 × 3 mm.

Same 24.5 mm diameter, but 1.2 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.

Same 24.5 mm diameter, but 5 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.

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

CR2430 is a 3 V lithium cell with a typical capacity of 270–290 mAh.

CR2430 is the same cell as 5011LC, DL2430 and ECR2430, so any of those codes will fit; no other cell here is 24.5 × 3 mm at 3 V.

CR2430 at actual relative size: 24.5 mm across, 3 mm thick. The dashed circle is a US quarter, 24.26 mm across (US Mint coin specifications).

The same cell under another code. Any of these fits, whatever the brand.

Same diameter, different thickness. These are not drop-in replacements.

Cell	Size	Verdict
CR2412	24.5 × 1.2 mm	Same 24.5 mm diameter, but 1.2 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.
CR2450	24.5 × 5 mm	Same 24.5 mm diameter, but 5 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.
CR2477	24.5 × 7.7 mm	Same 24.5 mm diameter, but 7.7 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.

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

LIR2430
Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.

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Is 5011LC the same as CR2430?: Yes. 5011LC is another code for the same cell: lithium (Li-MnO2), 3 V, 24.5 × 3 mm.
Is DL2430 the same as CR2430?: Yes. DL2430 is another code for the same cell: lithium (Li-MnO2), 3 V, 24.5 × 3 mm.
Will CR2412 work in place of CR2430?: Same 24.5 mm diameter, but 1.2 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.
Will CR2450 work in place of CR2430?: Same 24.5 mm diameter, but 5 mm tall instead of 3 mm. Only if the holder fits; thinner cells can lose contact.
Can I use LIR2430 instead of CR2430?: No. Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.
What voltage is CR2430?: CR2430 is a 3 V lithium cell with a typical capacity of 270–290 mAh.
What size is CR2430?: 24.5 mm across and 3 mm thick.