Technical Are all senders created equal?

So, I bought a set of aftermarket gauges for the Produce truck and I think the water temperature gauge sender is going south. I got the specs of the website, as far as the range and the resistance etc. but, I am pretty sure that the gauge company buys off the shelf senders.

The dealers won't or can't tell me the oem application.
Anyone here help?
Looking to buy one locally.

It's 100-250 degrees. 450 ohms cold.
1/8" NPT

 

Looks like these.
https://www.ebay.com/p/?iid=261870907960&lpid=82&&&ul_noapp=true&chn=ps
https://lmr.com/item/ATM-2259/1-8-N...vcgVKUDVHp4kZ33QtpeAkh3qN7BmYVEtM4aApo08P8HAQ

 

Try eGauges.com

 

Here's what I found:
c) Temperature - There are two "Datcon Match" Temperature Senders_ Typically the "Datcon-High" Sender is 1,000 Ohms at 100F to 87 Ohms at 220F while the "Datcon-Low" Sender is 450 Ohms at 100F to 46.4 Ohms at 220F. ***uming the engine is cold when the measurements are taken, the Senders should read somewhat higher resistance than their respective 100F resistances. NOTE: If the gauge was powered just prior to performing this test, the current through the sender/gauge circuit will cause some internal power dissipation within the sender_ This power dissipation (heat) will - in turn - cause the sender s resistance to drop somewhat (typically 10 - 20%) , and this factor should be taken into consideration when ****yzing the senders resistance readings.

http://www.datcon.com/en-US/Products/Datcon/Product-families/Senders-Sensors.aspx

 

And: http://www.speedwaymotors.com/Omega-Kustom-Electric-Water-Temperature-Gauge-Sender,34409.html

 

That's actually the sender I have from Speedway. The goal was to not have to order one in. I need to swap it out tomorrow. I figured Oreillys would have it. That information is helpful.

Thanks