No. These two sentences are not the same at all, emarbe. They are completely different.
You need to understand that the verb 'wish' has different meanings depending on the construction that follows it:
1. Wish + to + infinitive
"I wish to go" refers to a real situation in the future. It is more formal version of "I want to go" or "I'd like to go". For example, you might write this in a formal letter to express your desire to attend an upcoming event. Or you might see these instructions: "All students who wish to take part in the competition must register by 31 August.".
2. Wish + subjunctive
This is used to imagine a HYPOTHETICAL situation and is used to express regret. It's an expression of a desire for things to be different from how they really are or were. It can refer to any time period. Here are some examples:
You didn't go somewhere yesterday, but you now regret this decision -->
"I wish I had gone."
You want to go somewhere today/tomorrow, but you are unfortunately unable to do this -->
"I wish I could go"
You want your friend to go somewhere, but she is unwilling to go -->
"I wish she would go"
What about "I wish I went"? You might sometimes hear some native speakers say this as an alternative to "I wish I had gone" (to refer to a past event). However, it is non-standard and considered incorrect by educated speakers. Please don't teach this to your students!
The only context in which you could use "I wish I went" correctly is as the subjunctive form of "I go" (present simple). This would express regret about a present situation/habit. For example, a student who is unhappy about the school they go to and is envious of their friends' school might say "I wish I went to your school. Your teachers are much better than mine and your lessons are more fun".
I hope that's a bit clearer now. If you'd like to be sure that you've understood correctly, feel free to invent some examples of your own for me to check.