Very Confused On How Bands Works

[Low_Key_Slaps]

I'm comparing two different models of the S10. The T-mobile carrier model vs the Factory Unlocked model. Found this link for a direct comparison. 
https://www.techwalls.com/samsung-ga...3-differences/

If you compare the two under band support, you get some really confusing numbers and abbreviations which I will list off below. 

S10 Factory unlocked band support;
===============
2G GSM: GSM850, GSM900, DCS1800, PCS1900

2G CDMA: CDMA800, USPCS1900

3G CDMA: CDMA2000, EV-DO: 800, 1900 MHz

GSM 3G/3.5G: UMTS, HSPA+: 850, 900, 1700, 1900, 2100 MHz

4G LTE: 1, 2, 3, 4, 5, 7, 8, 12, 13, 14, 17, 18, 19, 20, 25, 26, 28, 29, 30, 38, 39, 40, 41, 46, 66, 71 Bands
=======================

S10 T-Mobile Carrier version:
======================
2G GSM: GSM850, GSM900, DCS1800, PCS1900

3G UMTS: B1(2100), B2(1900), B4(1700/2100 AWS1), B5(850)

3G TD-SCDMA: B34(2010), B39(1880)

4G FDD LTE: B2(1900), B4(AWS), B5(850), B12(700), B66(AWS-3), B71(600MHz)

4G TDD LTE: B46(5200)
=======================

As you can see, there are some terms or numbers missing from one model that are on the other, and vice versa. 

Can someone please walk me through what all this means and what the differences are? I want to be able to use Tmobile on the unlocked model without losing any band support or network coverage/quality.

Thank you!

[Low_Key_Slaps]

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