Create your first clip.
Then right-click that clip in the bin (top-left) and COPY. Right-click an open area of the bin and PASTE (Clip).
Click on the new clip, which will have a (1) in its name. Then click on the text box.
Swipe (highlight) the old text and type in the new. The original text clip won't be changed.
If you need fades, program a transparency and apply it to the first bin clip. 
Then make a copy as instructed above. Position it as desired on the sequence and replace the text. Drag its handles to change the duration.
Text parameters will be the same as long as they are not changed in the text compose window.
Duration of new text boxes will be based on the image default setting - OPTIONS | MEDIA.