How cool!

The same seller also has an early script from the original LBT film, too! With Littlefoot's name as "Thunderfoot!"

Wow, thank yo-o-ou a lot for pointing this out, Mu-u-ud Bro-o-other!
The fishy will amend my OP and add what you stated here. Also, I'll rename the thread to include the script for LBT 1 as you pointed out here as well.

There is also some points of interest that Mo-o-o is intrigued by. First of all, of course, as you stated, Littlefoot has his early name of "Thunderfoot" before they changed his name to what we know of today. Secondly, the title (fittingly) says "Land Before Time (Began)" which signifies the beginning of The Land Before Time franchise as know it. Thirdly, in the item description, one of the sentences says this:

An early working title for the film was The Land Before Time Began. Bluth, Spielberg and Lucas originally wanted the film to have no dialogue, like The Rite of Spring sequence in Fantasia, but the idea was abandoned in favor of using voice actors to make it appealing to children.

If this is true, it is quite a fun fact that Mo-o-o had no idea about. A movie having no dialogue would be pretty rare in the first place, right? Glad they went with the decision to have dialogue though, personally!

Fourthly, there are plenty of differences already as far as Mo-o-o can tell, between the final iteration of the movie and what is shown in the script. I invite everyone else to look at the photos at the link provided to spot them! I won't spoil it in this post.

How cool!

The same seller also has an early script from the original LBT film, too! With Littlefoot's name as "Thunderfoot!"

Arlene and Chie finished their kissing and Arlene moved into the tub with Dixie and Atrua.” Forgive me cutting in, girls, but I need to borrow Dixie for a moment. I need to get something for Oliver while we’re here, and I’m not sure what to get him. That, and I don’t have much money right now..” Arlene sighed.” You need to participate in the events here to make money. That and make up for all the time we lost.” Dixie said.” We have missed several locations. Fortunately Stripetail Scooby Tiger and Garfield have been understanding . The boys have been helping watch Oliver too.” Dixie added. “ oh yeah, he loves eating out with the guys, they usually get him pizza or subs or something.” Arlene said.  Big ones too, the kind that would feed me for over a week from just a small one.” Dixie laughed.” I know that feeling. Scooby doesn’t believe in small portions when it comes to food. We have the full pantries and fridges to prove it. “
One of my favorite foods in the  town is the met cheese roll flag. It’s seven atlternating meat and cheese rolls with seven different dipping sauces. The honey one is So good.” Atrua said.” Drat , now I’m hungry.” Arlene said.” Can we order some?” Dixie asked,” I’d like to try it. And I’ll be glad to pay for it.”  There’s a food phone in the main hall, for when prizes get the munchies.” Atrua said.” Come on girls, let’s go get some. Enough for everyone here too.”

I?

It is such great news if the script is real!!!!!             
Thank you everyone who helped to find it and to share information!

Hope someday we will see scripts for every sequel!

@StardustSoldier

Originally 3rd was 4th and 4th was 3rd, according to some storyboards.
https://www.gangoffive.net/index.php?topic=16525.0