Bass preamp instead of guitar preamp?

Can i use a bass preamp with a guitar and get same tones as i would a guitar equivelant?

The short answer is "No".

Guitar preamps have a number of special characteristics that make them different from other types. Without going into circuit schematics, the differences are mostly in frequency responses (including EQ curves as well as input/output stages) and gain stages.

Most guitar amps use a midrange woofer as their only speaker (no tweeters, horns, subs, or crossovers), and have a hard "cut" in frequency response above 8kHz or so to avoid overloading the speaker with excessive treble. This is a big part of the electric guitar's characteristic sound, but it also means that an electric guitar plugged into other types of amps will sound "weird" - there's too much treble response, resulting in a "hi-fi" sound that most players don't like.

However, most other electronic instruments (bass guitar, keyboards, vocal mics, etc) use a full-frequency, low-distortion amp with speakers to match, and you can mix-and-match these instruments across each other's amplifiers and expect them to sound, if not perfect, then at least acceptable. A PA is the perfect example; you can plug basically any instrument EXCEPT an electric guitar straight in, and they'll all sound right.

The other big thing is gain. Guitar amps are usually made with some kind of gain circuit to provide the overdriven/distorted sound that many guitarists like. This ranges from mild to very distorted depending on the amp, but most guitar amps do have them, while most non-guitar amps do not. Some bass amps (and preamps) DO have a distortion/OD circuit, but it's tuned for the input levels and frequency response of a bass guitar rather than a 6-string, so it won't sound "right".