There are some very real differences between what you learn through Lal Kitab and traditional Vedic Astrology. One example is the ascendant.
In LalKitab belief the ascendant is always Aries with the second house sign being Taurus and so forth. In traditional Vedic astrology you have to determine the ascendant by calculating the rising Zodiac sign on the eastern horizon when the person is born into the world.
The movement of the planets are not taken into account in LalKitab. It also has a special table that is used to make annual predictions based on planetary movement.
Divisions of the natal chart are not required with LalKitab. This system also takes a different approach to transit results, which are determined by monitoring the natal Moon in traditional Vedic astrology.
LalKitab distinguishes planets according to them being benefic or malefic, but they do not give separate planetary names depending on their placement. Behavior should be guided by horoscope planetary alignments. Behavior should also be guided by the need to correct the negative experiences being caused by mistakes in previous lifetimes.
LalKitab teaches that you can only have a peaceful, successful life this time around if you pay careful attention to the do's and don'ts list for this birth cycle. Believers will receive a complete prediction for the upcoming year one month prior to their birth month. This includes suggested remedies that should be paid careful attention to during the upcoming year.
Only an astrologer proficient and experienced in LalKitab can provide these remedies complete with difficulties and struggles that may be experienced and overcome in the year.
You can't mistake LalKitab as Black Magic or Tantra. It is more a path that leads to doing right and living successfully.