Is 24 the same as SR731SW?

Yes. 24 is another code for the same cell: silver oxide, 1.55 V, 7.9 × 3.1 mm.

Is 329 the same as SR731SW?

Yes. 329 is another code for the same cell: silver oxide, 1.55 V, 7.9 × 3.1 mm.

Works, but runs out sooner. Avoid in watches and medical devices.

Same 7.9 mm diameter, but 3.6 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.

Same 7.9 mm diameter, but 1.2 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.

SR731SW is a 1.55 V silver oxide cell with a typical capacity of 37 mAh.

7.9 mm across and 3.1 mm thick.

SR731SW is the same cell as 24 and 329, so any of those codes will fit; LR731 is the same size in alkaline and will work, though it runs out sooner.

IEC designation SR731.

SR731SW at actual relative size: 7.9 mm across, 3.1 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 size, different chemistry. Read the verdict before you buy.

Cell	Chemistry	Voltage	Verdict
LR731	alkaline	1.5 V	Downgrade Works, but runs out sooner. Avoid in watches and medical devices.

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

Cell	Size	Verdict
SR41	7.9 × 3.6 mm	Same 7.9 mm diameter, but 3.6 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR712SW	7.9 × 1.2 mm	Same 7.9 mm diameter, but 1.2 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR714SW	7.9 × 1.4 mm	Same 7.9 mm diameter, but 1.4 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR716SW	7.9 × 1.65 mm	Same 7.9 mm diameter, but 1.65 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR721SW	7.9 × 2.1 mm	Same 7.9 mm diameter, but 2.1 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR726SW	7.9 × 2.6 mm	Same 7.9 mm diameter, but 2.6 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
SR754SW	7.9 × 5.4 mm	Same 7.9 mm diameter, but 5.4 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.

On the shelf it is sold with a SR731 on the pack .

Is 24 the same as SR731SW?: Yes. 24 is another code for the same cell: silver oxide, 1.55 V, 7.9 × 3.1 mm.
Is 329 the same as SR731SW?: Yes. 329 is another code for the same cell: silver oxide, 1.55 V, 7.9 × 3.1 mm.
Can I use LR731 instead of SR731SW?: Works, but runs out sooner. Avoid in watches and medical devices.
Will SR41 work in place of SR731SW?: Same 7.9 mm diameter, but 3.6 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
Will SR712SW work in place of SR731SW?: Same 7.9 mm diameter, but 1.2 mm tall instead of 3.1 mm. Only if the holder fits; thinner cells can lose contact.
What voltage is SR731SW?: SR731SW is a 1.55 V silver oxide cell with a typical capacity of 37 mAh.
What size is SR731SW?: 7.9 mm across and 3.1 mm thick.