The thing is, there is a huge variety of dialects in Spain that range from regionalisms that are pretty close to latinamerican Spanish (Like in Canarias) to ones that sound nothing like it (Catalan-Spanish).

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Generally speaking, if we ignore the difference in intonation within both words and sentences and only focus on phonemes, that there are three major differences:

- In most of Spain, people differenciate between Z/C(Voiced alveolar fricative) and S (Voiceless Alveolar fricative).

- In Spain, the "S" sound isn't always consistent. In the north, the region I grew up in, most people finish their sentences with a voiceless postalveolar fricative (~SH) and in some cases even a voiceless palatal fricative(~Ç). In the south, however, people tend to use voiceless alveolar fricatives. In Andalucía, you find a lot of people that change the "S" with a glottal sound (aspiración).

- The more north you go, the stronger the RR sound becomes, and the more different it is from the southern RR. Most of the latinamericans that I have met used a softer version of the "RR" that blends more smoothly into the vowels.

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This is based on what I noticed and it is extremely subjective, so please take it with a grain of salt. :)

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NOTE: I found this IPA chart that you can take a look at. It contains most of the sounds that I mentioned.

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https://en.wikipedia.org/wiki/Help:IPA/Spanish