The difference between end rhyme and internal rhyme is where the rhyming words are placed.
In end rhyme the rhyming words are placed at the end of two consecutive sentences. For example:
There once was a man who wasn’t very smart.
For instance he once tried to drive a shopping cart.
Internal rhyme however is different. There are three types of internal rhyme. The first is having two or more rhyming words appear in the same line. For example:
I went to town to buy a gown. / I took a car it wasn’t far.
Internal rhyme can also be two or more rhyming words in the middle of two consecutive sentences. For example:
I hear the seas calling my name / the birds and bees beckoning me.
Finally it can also be an ending word rhyming with a word in the middle of the next line. For example:
I once went to a soccer arena . / The teams were Argentina and Spain.
Hope this helps!