Is 5003LC the same as CR2025?

Yes. 5003LC is another code for the same cell: lithium (Li-MnO2), 3 V, 20 × 2.5 mm.

Is DL2025 the same as CR2025?

Yes. DL2025 is another code for the same cell: lithium (Li-MnO2), 3 V, 20 × 2.5 mm.

Same 20 mm diameter, but 1.2 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.

Same 20 mm diameter, but 1.6 mm tall instead of 2.5 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.

CR2025 is a 3 V lithium cell with a typical capacity of 160–165 mAh.

CR2025 is the same cell as 5003LC, DL2025 and ECR2025, so any of those codes will fit; no other cell here is 20 × 2.5 mm at 3 V.

CR2025 at actual relative size: 20 mm across, 2.5 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
CR2012	20 × 1.2 mm	Same 20 mm diameter, but 1.2 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
CR2016	20 × 1.6 mm	Same 20 mm diameter, but 1.6 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
CR2020	20 × 2 mm	Same 20 mm diameter, but 2 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
CR2032	20 × 3.2 mm	Same 20 mm diameter, but 3.2 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
CR2040	20 × 4 mm	Same 20 mm diameter, but 4 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
CR2050	20 × 5 mm	Same 20 mm diameter, but 5 mm tall instead of 2.5 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.

LIR2025
Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.

Frequently used in digital watches and automobile remotes.

Is 5003LC the same as CR2025?: Yes. 5003LC is another code for the same cell: lithium (Li-MnO2), 3 V, 20 × 2.5 mm.
Is DL2025 the same as CR2025?: Yes. DL2025 is another code for the same cell: lithium (Li-MnO2), 3 V, 20 × 2.5 mm.
Will CR2012 work in place of CR2025?: Same 20 mm diameter, but 1.2 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
Will CR2016 work in place of CR2025?: Same 20 mm diameter, but 1.6 mm tall instead of 2.5 mm. Only if the holder fits; thinner cells can lose contact.
Can I use LIR2025 instead of CR2025?: No. Rechargeable Li-ion: 3.6-4.2 V and far less capacity; only for devices built for it.
What voltage is CR2025?: CR2025 is a 3 V lithium cell with a typical capacity of 160–165 mAh.
What size is CR2025?: 20 mm across and 2.5 mm thick.