Whatever the reason, attention to this error is important because you may sound like you are saying a different word than you are. Your listener will likely understand based on the context, but having to interpret what you are saying puts an increased cognitive load on the listener, and they may struggle to follow what you are saying as a result.
The pairs of consonant sounds are as follows:
voiceless: t voiced: d Examples: to, do
voiceless: p voiced: b Examples: poor, boor
voiceless: k voiced: g Examples: came, game
voiceless: f voiced: v Examples: fan, van
voiceless: s voiced: z Examples: sip, zip
voiceless: sh voiced: zh Examples: mesh, measure
voiceless: ch voiced: j Examples: choke, joke
voiceless: th (IPA /θ/) voiced th (IPA /ð/) Examples: thigh, thy
One helpful way to ensure you are pronouncing the final consonant with the correct voicing is to lengthen the vowel sound before the voiced consonant. For example, when we say the word "bead," we hold the vowel ee for a little step down because the "d" is voiced. When we say the word "beat" we don't hold the vowel ee for any additional length. Listen to the pairs below and try making a longer vowel and voiced sound to end the word. Then try some of the words in the list on your own.