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So confused. Are they pronounced differently?

Although I'm no expert, several websites I've read that attempt to explain Japanese say that the double consonant means you should pronounce the consonant for roughly double the length of a single consonant. An example quoted from here Double consonants

A double (geminate) consonsant, for example the kk in ikkentobi ("one-space jump"), indicates that the consonant is double length. This is indicated by doubling the consonant, except for sh (sh→ssh), ch (ch→tch), and ts (ts→tts).

Start to say the consonant, then stop the flow of air, pause for one syllable, and then finish saying the consonant. There are several sites that explain double consonants in this way or something similar. Perhaps a more scholarly example might be foundhere? b) There is a general rule that double consonants and double vowels do not have their English equivalents. Both are held for longer, and for roughly twice the articulation of single consonants or vowels. Japanese has numerous minimal pairs where the distinction is made by the opposing of single or double sounds. The distinction is recognised in the kana system, as one would expect.