like have done，not different

到 = the successful accomplishment of something 看到了 = managed to see; managed to be seen 我昨天把那個電影看到了 = I (finally) managed to see that film yesterday. 吃到了 = managed to eat; managed to be eaten (This one usually refers to restaurants where it is possible to eat certain dishes) 看了，吃了 only refer to completion of action.

"看到了，吃到了" means you expect it so much before ,finally you can see it and eat it ,it is the Tone of emphasis. but 看了，吃了，just mean you already seen it and eaten ....

看到了，吃到了 are like continuous tense.And they are kind of emotional.e.g happy ,excited etc .看了，吃了 are like past tense. That means the things you have done, someone who asks you that way must be fimilar with you .

“Verb+到”emphasis on the result of action. eg. 他向窗外看了好几次，但都没看到在下小雨。 我们一家人去那家中国餐馆吃过好几次饭，但都没有吃到过地三鲜这道菜。